Fitment：For Predator 212cc Only Hemi Engine Go Kart Cart. Package Includes:A Connecting Rod,18lb Valve Spring,Flywheel,Gasket kit,Magnetic Oil Drain Sump Plug Kit. When tightening the bolts, don't tighten them all at once. Tighten them in three stages to avoid stripping.Rod bolt torque: 170 Inch/lbs. These springs will provide extra performance at over 7000RPM. Length and Rate Tolerance will vary from spring to spring. The flywheel is made of a stronger aluminum material,reduced resistance, higher speed, increased power, can withstand greater pressure, in the case of maintaining high speed, can also be a good control of the valve, and reduce wear, effectively reduce the fault situation，the thread design plays a better fixing role.